Linux: How to list group members

The follwing group and user operations are usefull in linux

Add users

To add a user to Linux

$ sudo adduser username

List users

To list users in Linux

$ less /etc/passwd

To serch for users/a user

$ more /etc/passwd | grep username

List members in group

To list the members of a group in Linux

$ getent group groupname

Add user to group

To add a user to a group in Linux

$ sudo usermod -aG group usernamename